Fix a small memory leak: when an lsd is restarted, sometimes it will get RPCs for its own vnodes that it has not yet created.  Don't leak the arguments of those RPCs any more.
Fix a small memory leak: when an lsd is restarted, sometimes it will
get RPCs for its own vnodes that it has not yet created.  Don't leak
the arguments of those RPCs any more.

Add timing information to try and help catch what is causing RPCs from
odd source ports (and getting autocached and possibly into other stuff.)

weidezhang/dht,sit/dht,weidezhang/dht,weidezhang/dht,sit/dht,weidezhang/dht,sit/dht,sit/dht,weidezhang/dht,sit/dht